Might go back down to the resistance point of around 9.00 but only for awhile. Friday is the meeting for recommendation of approval in the EU, not the actual approval.
And if ARNA is not on this meeting agenda it will be on the February agenda. Share price will settle in after US sales launch regardless of EU approval or not.
Nothing is guaranteed in this business but ARNA approval in the EU is about as good of odds as it gets. It is Recommended in either January or February and then approved formally within a few weeks. (Need to check the other posts for exact dates following CHMP approval.